To set -chart upper and lower control limits,one must know the process central line,which is the
A)average of the sample means.
B)total number of defects in the population.
C)percent defects in the population.
D)size of the population.
E)average range.

Question

To set  -chart upper and lower control limits,one must know the process central line,which is the
A)average of the sample means. 
B)total number of defects in the population. 
C)percent defects in the population. 
D)size of the population. 
E)average range.

Quizplus · Accepted Answer

The process central line, also known as the process mean, is determined by calculating the average of the sample means. The upper and lower control limits are then set based on the variability of the process data around this central line. The other options, such as total number of defects, percent defects, size of population, and average range, are not directly relevant to setting control limits.

To Set -Chart Upper and Lower Control Limits,one Must